Optical Transport Network


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Optical Transport Network Description

Optical Transport Network [OTN]. Three line rates are defined in OTN: OTU1 at 2.666Gbps, OTU2 at 10.709Gbps, and OTU3 defined at 43.018Gbps. Two constant frame rates are also defined: 20.420kHz [48.971mS]; OTU1, 82.027kHz [12.191mS]; OTU3, and 329.489kHz [3.035mS]; OTU3.
OTN uses Reed-Solomon coding for FEC. The Reed-Solomon codes are 255,239 [239 information symbols, and 16 check symbols]

STM: Synchronous Transport Module [An information structure supporting section layer connections]
... STM-0: 21 E1 lines
... STM-1: 63 E1 lines or 1 E4 line
... STM-4: 252 E1 lines or 4 E4 lines
... STM-16: 1008 E1 lines or 16 E4 lines
... STM-64: 4032 E1 lines or 64 E4 lines
... STM-256: 16128 E1 lines or 256 E4 lines

The structure of the SDH Frame is shown above. The basic SDH frame format is the Synchronous Transport Module [STM], with STM-1 as the base-level. The SDH frame is formed by 9 rows by 270 bytes with a duration of 125uS. The first 9 bytes of each row composed of the Section Overhead. The remaining 270 bytes form the Synchronous Transport Module payload.

STS: Synchronous Transport Signal
... STS-1: 28 DS1s or 1 DS3
... STS-3: 84 DS1s or 3 DS3s
... STS-12: 336 DS1s or 12 DS3s
... STS-48: 1344 DS1s or 48 DS3s
... STS-192: 5376 DS1s or 192 DS3s
... STS-768: 21504 DS1s or 768 DS3s

OTN Frame Structure

The structure of the SONET Frame is shown above. The basic SONET frame format is the Synchronous Transport Signal [STS], with STS-1 as the base-level. The SONET frame is formed by 9 rows by 90 bytes with a duration of 125uS. The first 3 bytes of each row [27 bits] composed of the Transport Overhead [TOH], the section may also be seen as the Section and Line header overhead. The remaining 87 bytes form the Synchronous Payload Envelope [SPE]. The overhead bits handle; Section Overhead, Line Overhead, STS Path Overhead, and VT Path Overhead.

Optical Transport Network Standards Information

Optical Transport Network [OTN]; ITU G.709
ITU-T G.709, "Interfaces for the Optical Transport Network", March 2003
ITU-T G.872, "Architecture of Optical Transport Networks", November 2001
ITU-T G.873.1, "Optical Transport Network (OTN): Linear Protection", March 2003

SONET Synchronous Optical NETwork. ANSI standard {American National Standards Institute}
SDH Synchronous Digital Hierarchy ITU Standard [International Telecommunication Union]

Optical Transport Network Interface IC Manufacturers

SPI-3 Devices

SPI-4 Devices

IC Semiconductor Manufacturers {All other types}

Gigabit Optical Transceiver

Agilent Technologies {10 Gigabit pluggable optical transceivers}

JDS Uniphase Corporation {Transceiver, 10 GbE/FC, XFP, 1310 nm }

Intel {10Gbps XFP Optical Transceiver}

Mitsubishi Electric Corp. {10Gbps Optical Devices, XENPAK Transceiver Module}

NEC Corp. {10Gbps Optical Devices, XENPAK Transceiver Module, SC / LC Interfaces}

OpNext inc.

10G Optical Module Form Factors: [Length x Width]
SFP: 16mm x 42mm
XFP: 23.5mm x 67mm
X2: 42mm x 79mm
XPAK: 42mm x 72mm
XENPAK: 47mm x 118mm
A description of Optical Transceivers is listed on the 10G Optical Module Form Factors page

Definitions:
Data Communications Channel [DCC]
Dense Wave Division Multiplexing [DWDM]
Forward Error Correction [FEC]
Frame Alignment Signal [FAS]
Optical channel Data Unit [ODU]
Optical channel Payload Unit [OPU]
Optical channel Transport Unit [OTU]
Reed-Solomon [RS]

Engineering Design Key words: Optical Transport Network, OTN, SONET Bus, SDH, Synchronous Optical NETwork, Electrical Standard, Interface Standard, Specification, Spec, Fiber, Electrical Interface, Data Rate, IC Semiconductor manufacturers, Physical Interface, Engineering Description, electrical characteristics, Component Manufacturers, Optical Carrier, Line-Terminating Equipment, LTE, Path-Terminating Equipment, PTE

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